exam 1 class 2 and 3 Flashcards
homeo
similar
homo
same
transition between an organisms external environment and the intracellular fluid inside the cells
extracellular fluid (ECF)
buffer zone between cells and outside world
ECF
principle of mass balance
input=output
intake routes of the human body
mouth, nose, skin
output routes of the human body
skin nose kidneys
Homeostasis is not the same as
equilibrium
when external environment is stable and reaction or metabolic pathway has a constant rate
steady state homeostasis
rate or forward does not equal rate of reverse
rate of input=rate of output
steady state homeostasis
what happens when an external environment is not stable?
- temp changes
- organism responds ACTIVE REGULATROY CONTROL MECHANISMS
- balanced again
restricted to tissue or cell involved
local control
decrease in oxygen conc. in the tissues is an example of what?
local control
long distance pathway that uses the nervous system, endocrine system or both
reflex system
maintaining blood pressure in body is an example of what?
reflex control
response loop + feedback loop=?
reflex loop
input signal + integrating center + output signal +response =?
response loop
nervous/ endocrine system
integrating center
chemical signals, electrical signals or both
output signal
any cell of the body
target
the response “feeds back” to influence the input portion of the pathway
feedback loop
2 types of feedback loops
-positive feedback
- negative feedback
negative feedback loops is homeostatic or not homeostatic?
homeostatic
postitive are homeostatic or not homeostatic?
not homeostatic
